When moving clips on the edit page you should get to know what the CTRL, ALT and SHIFT keys do. As modifiers they enable a variety of ways to move, extend, copy etc clips. I’m sure Mr Alex Tech has some good YouTube tutorials on how these modifiers should be used individually and together. There are a lot of options on how you move, trim etc.
It is also possible to lock tracks to prevent audio moving while moving or deleting video tracks without unlinking. On the Fairlight page, you can move audio tracks around without affecting the video tracks so it is like an automatic locking of video tracks when working on audio. I prefer to use that page to extend, edit and move around audio, knowing my video tracks will not move around.
As for re-programing keyboard functionality, the keyboard editor allows you to create custom key commands and assign them to any key.